Millstone.



No, 773,363. PATENTED OUT. 25, 1904.

G. P. ANDERSON.

MILLSTONE.

JAN. 22, 1904.

APPLICATION FILED NO MODEL.

mfg E 55- E 5,

. 3/ K I v Patented October 25, 1904.

NITE STATES ATENT OFFICE.

CARL P. ANDERSON, OF EVERETT, MASSACHUSETTS.

MILLSTONE.

SPECIFICATION forming part of Letters Patent No. 773,363, dated October25, 1904.

Application filed January 22, 190 Serial No. 190,150. (No model.)

To all whom it ntay concern:

Be it known that I, CARL P. ANDERSON, a citizen of the United States,and a resident of Everett, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inMillstones, of which the following is a specification.

This invention relates to improvements in millstones for grinding paint,grain, or other materials, and it relates especially to the constructionof the feed-furrows in such a manner as to render them capable of beingreadily dressed from time to time as the face-of the stone wears out, aswill hereinafter be more fully shown and described, reference being badto the accompanying drawings, wherein Figure 1 is a top plan view of oneof a pair of my improved millstones. Fig. 2 is a crosssection on theline 2 2 in Fig. 1, showing the feed-furrows filled with a suitablematerial softer than the body of the stone; and Fig. 3 is across-section on the line 3 3 in Fig. 1.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

The invention relates especially to molded millstones made of emerycomposition or the like, but may also be applicable to natural materialstones without departing from the essence of my invention.

In the drawings, A represents a preferably molded millstone on which Eis the central perforation, as usual. On the face of such stone isarranged a series of tangential feedfurrows C 0, extending from themiddle of the stone to nearly the outer periphery thereof with a solidportion A being left in the stone at the outer end of each feed-furrow,as shown in Figs. 1 and 2. The said feed-furrows extend only partiallythrough the thickness of the stone, leaving a solid portion A. at thebottom of each feed-furrow, as shown in the drawings. The saidfeed-furrows are afterward filled with suitable material or compositionD softer than the body of the stone, and for such purpose I may usecement, sulfur, or any desired material or composition that is softerand more readily shaped or dressed than the body of the stone. The faceof such composition in the feed-furrows can readily be dressed to theinclination, as shown at (Z in Fig. 3, and this can readily be done byany suitable tool, such as a carpenters chisel, a scraper, or the like.

In ordinary millstones, either natural or hand composition ones, thefeed-furrows are out directly in the face of the stones by a pick orsimilartool, and this has to be repeated from time to time during thewear and subsequent refacing of the stone, which renders the operationboth costly and time-consuming. By making tangential furrows in thestone and filling the same with a material, substance, or compositionconsiderably softer than the body of the stone, such feed-furrows can bereadily shaped or dressed from time to time as occasions may requiresimply by scraping off or removing a portion of the softer material Dcontained in said feed-furrows, as above described. In addition to suchtangential feed-furrows the face of the stone is provided with theordinary smaller furrows, as is common in millstones.

Between the main furrows C and extending from the perforation B to theperiphery of the molded millstone and also extending from the outer endsof the said main furrows to said periphery are auxiliary furrows, as E,represented as tangential. These auxiliary furrows, like the mainfurrows, are situated in the upper or working face of the stone andserve their usual purpose in grinding.

What I wish to secure by Letters Patent and claim is In a millstone, acircular body of suitable material, having a central opening, a seriesof main feed-furrows extending outward from said opening toward butshort of the periphery of said body, and a series of auxiliary furrowsextending outward from said opening to the periphery between the furrowsand also extending outward from the outer ends of the main feed-furrowsto said periphery, whereby a portion of the stock of the body will beleftbetween the outer end walls of the several feed-furrows and theperiphery of said body, and filling material in the furrows, softer andmore readily shaped or dressed than said body. In testimony whereof Ihave affixed my signature in presence of two witnesses.

CARL P. ANDERSON. Witnesses:

ALBAN ANDREN, LAURETZ N. MoLLER.

